A-dec Dental Equipment

A-dec 400 dental chair
A-dec dental chair with plum upholstery and dental delivery system

A-dec 400 Dental Chair

Smart. Versatile. Strong. Instead of sacrificing ergonomic access to the oral cavity for patient comfort, have both with the A-dec 400 dental chair. Get robust construction, contemporary styling, and left/right versatility with a Radius delivery system.

A-dec 5 year warranty logo
Patient in A-dec 400 dental chair

Comfort for your patients

The A-dec 400 dental chair helps put your patients at ease. The virtual pivot synchronizes the movement of the dental chair with the anatomy and motion for the patient. The toeboard tilt design provides the patient with comfortable support of the lower legs. Together, they create a cradling effect for the patient.

Ergonomic design

The key to productivity and career longevity is remaining comfortable while you work. This is why A-dec 400 is designed to keep your movement fluid and ergonomically aligned.
Dentist and patient with continental delivery system
A-dec 400 dental chair versatility

Left/right versatility

The Radius delivery systems, cuspidor, and assistant's instrumentation quickly and easily rotate around the chair for complete left/right compatibility.

A-dec 400 dental chair features

Ultra-thin backrest that "flexes" (1", 25 mm). Enables you to tuck your knees under the chair providing ergonomic access to the oral cavity.

Double-articulating, gliding headrests. Adjusts easily for optimal patient positioning. Available in locking knob and lever release styles.

Hybrid chairlift system. Combines the power of a hydraulic base and the smoothness of an electro-mechanical tilt, allowing simultaneous movement for quicker patient positioning.

2-position armrests. Combines comfortable arm/elbow support with a robust load-bearing design for easy patient entry and exit.

60º swivel with brake. Allows 30º rotation on each side of center.

Cut-away, cast iron baseplate. Allows you to roll your stool closer to the patient; provides six contact points for added stability on uneven floors.

A-dec dental chair with plumb upholstry
A-dec 400 Dental Chair
Base height range Low point: 13.75" (349 mm), 14.75" (375 mm) with dual mount
High point: 31.5" (800 mm)
Backrest Ultra-thin 1" (25 mm) flexible backrest. (Based on formed upholstery)
Headrest Dual-articulating, gliding headrest with locking knob; lever release style (optional)
Armrests 2-position armrests
Chair swivel 60° (30° each side of center)
Power supply 300-watt
Chair control Delivery system touchpad or foot switch
Lift system Hybrid drive (electromechanical tilt, hydraulic base)
Upholstery options Sewn or formed
Load rating The A-dec 400 dental chair is rated to 400 lb (181 kg) maximum patient load. The chair is tested to 4X (1600 lb/725 kg) to ensure safety.

A-dec 400 dental chair upholstery

What's your color? A-dec offers an array of choices in formed or sewn upholsteries to create an environment that reflects your style.

A-dec dental operatory package with A-dec 400 dental chair

A-dec 400 Radius operatory package

True ambidextrous configuration accommodates varied doctor preferences. The Radius delivery and support modules quickly and easily rotate around the chair for left/right compatibility.
The A-dec 400 with sewn upholstery ticked all the boxes for me in terms of price, comfort, quality and ease of use.
DR Ken Chan
Dr. Kenneth Chan
Capstone Dental
Seven Hills, NSW, Australia

Dental equipment options

Delivery systems

Four choices for delivery of your handpieces and accessories: A-dec 300 Traditional or Continental delivery system (chair-mounted); A-dec 500 12-o’clock duo or A-dec 300 side delivery system (cabinet-mounted).

A-dec 400 dental chair with traditional dental delivery system

Dental lights

A-dec LED dental lights bring a lot to your practice. A clearer view of tooth surfaces. Reduced eyestrain. Less fatigue. Choose the A-dec 500 LED dental light or the A-dec 300 LED dental light.

A-dec 400 dental chair with dental light

Monitor mounts

Monitor mounts pivot to accommodate viewing from a variety of patient positions. Increase case acceptance when you incorporate the use of an intraoral camera with a chairside monitor.

A cabinet-mounted monitor at 12 o’clock makes an excellent choice for patient record keeping and practice management applications. Ceiling, wall, and central/side cabinet-mounted monitors are ideal for providing patient entertainment in either seated or supine positions.

A-dec 400 dental chair with monitor mount


Vitreous china bowl with bowl screen. Programmable cup fill and bowl rinse timers. Rotates +/-45°. Requires support center.

A-dec dental chair with cuspidor

How do you clean an A-dec dental chair?
A-dec recommends cleaning the upholstery using a solution of mild, non-ionic detergent and water, or commercially available cleaners containing no alcohol, bleach, or ammonia. Get more information in the A-dec Upholstery Maintenance Guide.

How long should a dental chair last?
With proper maintenance and service, A-dec dental chairs are designed and tested for a “service life” of 20 years under normal use. The actual service life can be influenced by factors such as environment, extent of use, cleaning and maintenance frequency, and preventative maintenance of normal service “wear & tear” components. Please review A-dec’s customer warranty for complete details, including applicable disclaimers and limitations of liability.

What’s the weight capacity of the A-dec 400 dental chair?
The A-dec 400 dental chair is rated to 400 lb (181 kg) maximum patient load. The chair is tested to 4X (1600 lb/725 kg) to ensure safety.

What is the cost of an A-dec 400 dental chair?
You can customize your dental chair with many different equipment options. Contact your local A-dec dealer.

How do you reupholster A-dec dental chairs?
Replacement upholstery can be ordered through your local A-dec dealer. Get upholstery color and replacement upholstery information.

What is the warranty for an A-dec dental chair?
A-dec is pleased to offer a 5-year warranty for all dental equipment and furniture purchased from an authorized A-dec dealer. See A-dec, Inc. Express Limited Warranty for full warranty information.

How do you order genuine A-dec replacement parts for your dental chair?
To order replacement parts, please contact your local A-dec dealer.

How do you maintain A-dec dental equipment?
Daily and preventative maintenance will help keep your dental equipment running smoothly. Use the Dental Equipment Maintenance checklist for easy reference.

How do you operate/adjust key features on the A-dec 400 dental chair?
Reference the A-dec 411 Dental Chair Instructions for Use for specifics around chair operation and adjustments.

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What to look for when buying dental equipment

Dental equipment guide

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